<template>
  <el-container class="home-container">

    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/logo.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>

    </el-header>

    <!-- 主体区域 -->
    <el-container>

      <!-- 侧边栏 -->
      <el-aside :width="isCollpase?'64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409eff" :unique-opened='true'
          :collapse="isCollpase" :collapse-transition="false" router :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span v-text="item.authName"></span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id"
              @click="saveNavState('/'+subItem.path)">
              <template slot="title">
                <i class="el-icon-menu"></i>
                <span v-text="subItem.authName"></span>
              </template>
            </el-menu-item>

          </el-submenu>

        </el-menu>
      </el-aside>
      <!-- 右侧主体区域 -->
      <el-main>
        <!-- 这里就是供/home下的子路由显示的位置 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
  export default {
    data() {
      return {
        // 左侧菜单数据
        menulist: [],
        iconsObj: {
          125: 'iconfont icon-user',
          103: 'iconfont icon-tijikongjian',
          101: 'iconfont icon-shangpin',
          102: 'iconfont icon-danju',
          145: 'iconfont icon-baobiao'
        },
        // 是否折叠 的变量
        isCollpase: false,

        // 被激活的链接地址
        activePath: ''
      }
    },
    created() {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
      logout: function () {
        window.sessionStorage.clear()
        this.$router.push('/login')
      },
      // 获取所有的菜单
      getMenuList: async function () {
        const {
          data: res
        } = await this.$http.get('menus')
        console.log(res)
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
      },
      // 点击按钮 切换菜单的折叠与展开
      toggleCollapse() {
        this.isCollpase = !this.isCollpase
      },
      // 保存链接的激活状态
      saveNavState(activePath) {
        window.sessionStorage.setItem('activePath', activePath)
        this.activePath = activePath
      }
    }
  }

</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }

  .el-header {
    display: flex;
    justify-content: space-between;
    background-color: #373d41;
    padding-left: 0px;
    align-items: center;
    color: #fff;
    font-size: 20px;

    >div {
      display: flex;
      align-items: center;

      img {
        height: 60px;
      }
    }

    span {
      margin-left: 10px;
    }
  }

  .el-aside {
    background-color: #333744;

    .el-menu {
      border-right: none;
    }
  }

  .el-main {
    background-color: #eaedf1;
  }

  .iconfont {
    margin-right: 8px;
  }

  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    text-align: center;
    color: #fff;
    cursor: pointer;
    letter-spacing: .2em;
  }

</style>
